If you upload your pictures or student artwork to Google+ Photos (the new picasaweb), you will be able to place a slideshow gadget on your Google site.
Find a page on your google site. Click the edit pencil. Place your cursor where you would like to put your album gadget. Follow the graphic below.
Select an album.
Choose whichever options you like or leave the settings as is.
Click save, then save again to see it how visitors to your site will see it.
How you can share pictures and artwork in slideshow format.